Background

These data are pulled from FSIS (online, downloaded Nov 2021) and GeoHub (https://geohub.lio.gov.on.ca/datasets/mnrf::historical-fish-stocking-data-1900-1999/about). The quality of the data pre-FSIS is unknown (there are data missing - use with caution).

In total, 5895 Brown Trout stocking records were found (see the table below for breakdown by years).



Brown Trout stocking data summary, showing missing data.
Missing Data Count
Bin Events Weight_NA Age_NA
1929-1945 5 5 5
1946-1960 1,151 1,151 1,151
1961-1981 22 22 22
1982-2000 1,733 412 1,731
2001-2021 2,984 207 46
Total 5,895 1,797 2,955


Life stage

These tables show the age and weight ranges (min and max) of the various Brown Trout life stages for both ‘old’ and ‘new’ data sets. n = number of stocking events of the particular life stage. Spring Yearling is the most popular Brown Trout life stage for stocking.

Note that the range of weights for most life stages suggests that there are errors/outliers - see box plots below. Seems to be a problematic variable, regardless of year.

Brown Trout life stage summary
LIFESTAGE n min_age max_age min_wt max_wt
Egg 2 0 0 0.59 0.59
Fry 180 1 2 0.02 1.50
Spring Fingerling 374 3 10 0.30 118.00
Fall Fingerling 676 6 11 1.21 242.60
Spring Yearling 3,958 12 19 16.00 221.70
Fall Yearling 439 12 18 0.35 175.00
Sub-adult 148 20 35 45.00 6,200.00
Adult 118 36 88 400.00 6,200.00





Number

Note that eggs are not included in row totals.

Should cross-reference these numbers with other sources to make sure the broad trends make sense (particularly 1960 - 1980: did we really stop stocking Browns?).

YEAR Egg Fry Spring Fingerling Fall Fingerling Spring Yearling Fall Yearling Sub-adult Adult Total
2021 — — 35,184 — 232,619 — 1,088 838 269,729
2020 — — 35,000 27,075 227,738 5,964 6,905 216 302,898
2019 — 1,670 44,000 97,994 244,479 — 26,993 139 415,275
2018 — — 64,215 74,291 256,004 10,287 7,666 436 412,899
2017 — — 42,055 103,542 250,109 1,100 5,203 153 402,162
2016 — 807 26,046 146,989 268,897 2,000 8,352 — 453,091
2015 — — 30,114 91,936 293,228 37,645 — 278 453,201
2014 — 330 13,885 49,997 256,230 — 3,060 389 323,891
2013 — — 35,120 192,871 270,401 11,116 3 — 509,511
2012 — 1,612 67,325 153,230 307,586 — — 176 529,929
2011 — — 53,240 111,116 293,844 — 12 18 458,230
2010 — 11,087 156,900 170,351 306,070 — — 43 644,451
2009 — — 67,700 333,412 278,487 — 8 470 680,077
2008 — — 155,050 285,203 299,373 — 15 669 740,310
2007 — 3,850 137,475 494,761 269,016 95,677 46 — 1,000,825
2006 — 70,175 178,294 170,432 175,004 40,581 8,183 27 642,696
2005 — 2,345 36,500 309,690 274,953 845 9,867 353 634,553
2004 — 4,300 114,212 125,040 305,880 97,152 315 560 647,459
2003 — 4,500 17,702 221,332 289,029 52,890 — 667 586,120
2002 — 3,518 16,050 304,565 299,260 4,500 11,500 — 639,393
2001 — 1,000 127,600 122,452 272,437 — — — 523,489
2000 — 48,500 20,961 25,930 255,805 118,876 — 25 470,097
1999 1,271 — — — 276,637 126,360 783 — 405,051
1998 1,700 57,820 500 — 237,382 157,802 11,169 — 466,373
1997 — 45,414 87,030 6,011 300,949 179,799 — — 619,203
1996 — — 54,000 57,003 285,612 157,773 — 28 554,416
1995 — 50,000 2,500 — 351,715 172,132 — — 576,347
1994 — — 35,000 — 331,564 149,998 820 850 518,232
1993 — — 53,726 — 320,845 3,570 400 391 378,932
1992 — — — 35,499 465,399 24,362 1,048 721 527,029
1991 — — 23,500 57,040 572,564 161,277 1,610 — 815,991
1990 — 14,814 11,000 24,820 585,959 2,033 548 — 639,174
1989 — 40,200 42,450 32,215 485,054 100 1,016 — 601,035
1988 — 22,757 — 77,551 463,495 23,701 1,035 — 588,539
1987 — 19,888 2,304 104,907 307,609 44,768 669 — 480,145
1986 — 24,375 1,860 55,484 284,928 25,489 955 — 393,091
1985 — 33,120 — — 137,538 27,395 930 — 198,983
1984 — 19,231 — 39,968 122,409 — 3,465 — 185,073
1983 — 12,239 — — 134,271 — — — 146,510
1982 — 8,335 — 22,120 — 49,150 — — 79,605
1976 — 2,500 — — — — — — 2,500
1975 — 3,800 — — — — — — 3,800
1971 — — — — — 10,000 — — 10,000
1969 — — — — 1,900 — — — 1,900
1966 — — — — 1,000 — — — 1,000
1962 — — — — 8,000 — — — 8,000
1961 — — 640 — 3,500 500 — — 4,640
1960 — — 1,700 — 81,315 7 — — 83,022
1959 — — — — 157,490 5,200 — — 162,690
1958 — — 8,000 21,800 175,255 3,680 — — 208,735
1957 — — 3,000 24,500 136,900 2,400 — — 166,800
1956 — — 39,000 20,000 137,950 — — — 196,950
1955 — 32,000 28,000 10,300 211,400 2,500 — — 284,200
1954 — — 3,000 67,000 140,100 14,700 — — 224,800
1953 — 5,000 42,000 2,000 89,700 — — — 138,700
1952 — — 5,100 80,000 104,500 3,000 — — 192,600
1951 — 32,000 34,500 131,500 42,942 — — — 240,942
1950 — — 62,000 97,000 76,300 24,175 — — 259,475
1949 — — 90,000 10,000 181,500 5,400 — — 286,900
1948 — 199,000 71,200 139,640 259,463 28,720 — — 698,023
1947 — — 3,000 — 144,400 65,850 — — 213,250
1946 — — 7,000 77,500 147,900 73,690 — — 306,090
1945 — — — — — 1,200 — — 1,200
1933 — — 35,000 — — — — — 35,000
1932 — — 10,000 — — — — — 10,000
1931 — — 110,000 — — — — — 110,000
1929 — — — — 400 — — — 400
Total 2,971 776,187 2,341,638 4,806,067 13,692,294 2,025,364 113,664 7,447 23,765,632


Mean Weight by Lifestage

Only data produced at MNR facilities used.



Biomass

Note: biomass is given in kg.

YEAR Egg Fry Spring Fingerling Fall Fingerling Spring Yearling Fall Yearling Sub-adult Adult Total
2021 – – 70 – 10,543 – 206 1,935 12,754
2020 – – 70 561 11,431 95 1,818 860 14,835
2019 – – 175 1,632 13,622 – 4,726 625 20,780
2018 – – 70 1,398 14,553 90 2,948 1,477 20,536
2017 – – 70 2,312 13,699 31 2,014 585 18,711
2016 – – 40 2,551 14,938 73 1,929 – 19,531
2015 – – 240 1,519 13,593 1,506 – 688 17,546
2014 – – – 1,248 9,497 – 312 1,002 12,059
2013 – – – 3,105 12,259 860 14 – 16,238
2012 – – 64 3,438 12,789 – – 620 16,911
2011 – – – 1,269 11,395 – 74 112 12,850
2010 – 11 – 4,844 11,559 – – 258 16,672
2009 – – 30 4,031 10,674 – 40 1,165 15,940
2008 – – – 7,067 14,752 – 45 1,490 23,354
2007 – – 70 6,999 13,810 1,917 80 – 22,876
2006 – 70 86 3,829 9,834 1,140 1,227 111 16,297
2005 – 1 64 5,687 14,367 41 1,130 501 21,791
2004 – – 1,700 2,784 14,399 5,540 218 667 25,308
2003 – – 13 5,139 15,078 1,304 – 1,033 22,567
2002 – – – 11,414 19,802 93 1,254 – 32,563
2001 – – 3 3,140 16,062 – – – 19,205
2000 – 9 122 504 14,567 3,210 – 10 18,422
1999 1 – – – 12,622 3,296 422 – 16,341
1998 1 9 0 – 10,844 3,348 1,393 – 15,595
1997 – 6 111 42 9,021 4,840 – – 14,020
1996 – – 1,890 824 12,218 4,362 – – 19,294
1995 – – – – 14,037 4,000 – – 18,037
1994 – – – – 15,932 3,850 325 1,251 21,358
1993 – – 72 – 16,073 103 163 847 17,258
1992 – – – 425 21,760 913 236 959 24,293
1989 – – 24 261 19,022 18 931 – 20,256
1988 – – – 365 16,950 216 749 – 18,280
1987 – – – 1,163 14,174 – 407 – 15,744
1986 – – – 82 10,158 262 706 – 11,208
1985 – – – – 3,116 483 642 – 4,241
1984 – 2 – 268 4,982 – 1,098 – 6,350
1983 – 0 – – 3,966 – – – 3,966
1982 – – – 283 – 603 – – 886
Total 2 108 4,984 78,184 478,098 42,194 25,107 16,196 644,873


Map

Click on the point to see a summary of how many fish have been stocked at that site, number of stocking events, and the span of years (min and max) over which stocking has been done at this location.



Trend by FMZ

Note that stocking records without spatial data could not be assigned to an FMZ, so data from those stocking events are not included in these plots.



Biomass Summary by FMZ

Weight data missing for some years - use these data with caution